STM32 HAL - USART & DMA

/* USER CODE BEGIN PV */

/* Private variables ---------------------------------------------------------*/

uint8_t RxBuffer[50];

#define MAX_RECEIVE 4

volatile int i = 0;

/* USER CODE END PV */

/* USER CODE BEGIN 0 */

/**

  * @brief Rx Transfer completed callback.

  * @param huart UART handle.

  * @retval None

  */

__weak void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(huart);

  /* NOTE : This function should not be modified, when the callback is needed,

            the HAL_UART_RxCpltCallback can be implemented in the user file.

   */

  i += 3;

  HAL_UART_Receive_DMA(&huart2, &RxBuffer, MAX_RECEIVE);//sizeof(RxBuffer)); // definate max len of RxBuffer

}

/* USER CODE END 0 */

/* USER CODE BEGIN 2 */

  char Retezec[] = "STM32L476 USART DMA Rx test JFila\r\n";

  HAL_UART_Transmit(&huart2, &Retezec, (uint16_t)sizeof(Retezec), 10);

  HAL_UART_Receive_DMA(&huart2, &RxBuffer, MAX_RECEIVE);//sizeof(RxBuffer)); // definate max len of RxBuffer

  // ETXI0 also interrupt DMA transfer

  /* USER CODE END 2 */

/**

* @brief This function handles EXTI line0 interrupt.

*/

void EXTI0_IRQHandler(void)

{

  /* USER CODE BEGIN EXTI0_IRQn 0 */

  volatile uint8_t RxCount = MAX_RECEIVE - huart2.hdmarx->Instance->CNDTR;

  RxBuffer[RxCount] = 0;

  HAL_UART_AbortReceive_IT(&huart2);

  HAL_UART_Receive_DMA(&huart2, &RxBuffer, MAX_RECEIVE);

  /* USER CODE END EXTI0_IRQn 0 */

  HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);

  /* USER CODE BEGIN EXTI0_IRQn 1 */

  /* USER CODE END EXTI0_IRQn 1 */

}